* {
    margin: 0;
    padding: 0;
}

.score_title {
    margin: 50px 0px 0px 250px;
    font: 32px "Microsoft YaHei UI";
    ;
}

.score_input {
    margin: 50px 0px 50px 100px;
    font-size: 32px;
    border-radius: 15px;
    text-align: center;
}

.box {
    width: 400px;
    height: 400px;
    border: 5px solid pink;
    border-radius: 15px;
    margin-left: 100px;
    position: relative;
}

.box
.game {
    position: absolute;
    /*top: -50px;*/
}

.box
.game
.row
.column {
    /* width + height 搭配 float 一起使用, 柔性计算出 1 row = 4 column */
    width: 98px;
    height: 98px;
    border-top: 1px solid white;
    float: left; /* float 尽可能占用 parent 所剩余的空间 */
}

.box
.game
.row
.column.black {
    border-radius: 8px;
    background-color: black;
}